ibook G4 DVD/CD drive not working!!

I have a quick question for the gurus meandering this forum. Everytime I put either a DVD or a CD into my ibook, it spins around for a bit and spits it back out. I've tried numerous DVD's and CD's but it's all the same. I was wondering if there were any hints you could provide to fix this or if my only option is sending it in. Thanks.

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